The MC79L05CG is a three-terminal negative voltage regulator from Freescale Semiconductor (now NXP). It is designed to provide a fixed output voltage of -5V with a low dropout voltage and a maximum output current of 100mA. This makes it suitable for a wide range of applications requiring a stable negative voltage supply.

Applications

• Local On-Card Regulation: Provides a regulated -5V supply directly on a circuit board, minimizing noise and improving overall system performance.
• Negative Voltage Power Supply: Used in circuits requiring a stable -5V power rail, such as operational amplifiers, data acquisition systems, and analog circuitry.
• Post Regulation: Can be used after a switching regulator to further reduce ripple and noise.
• Battery Chargers: Used in conjunction with other components to provide a regulated charging voltage for batteries.
• Instrumentation: Powers sensitive analog components in instrumentation equipment.

Features

• Fixed Output Voltage: Provides a stable -5V output.
• Low Dropout Voltage: Operates with a minimal difference between the input and output voltage.
• Internal Short-Circuit Current Limiting: Protects the regulator and the load from damage due to short circuits.
• Internal Thermal Overload Protection: Shuts down the regulator if the junction temperature exceeds a safe limit.
• Output Transistor Safe-Area Compensation: Ensures stable operation over a wide range of operating conditions.

Benefits

• Stable Negative Voltage Supply: Provides a reliable and consistent -5V output, ensuring proper operation of connected circuits.
• Protection Against Fault Conditions: Internal current limiting and thermal shutdown features protect the regulator and the load from damage.
• Simple to Use: Requires minimal external components for operation.
• Cost-Effective: Offers a cost-effective solution for generating a regulated -5V supply.
• Wide Operating Temperature Range: Can operate reliably over a wide range of ambient temperatures.

Additional Details

The MC79L05CG is typically available in a TO-92 package. It requires minimal external components, usually just input and output capacitors to improve stability. The input voltage must be slightly higher than -5V for the regulator to function correctly. Consult the datasheet for specific values and operating conditions.